Here's a good introduction: https://www.motherjones.com/politics/2017/03/silicon-valley-...
There's nothing definitive in this article specifically, mind you; but for one you can read more about his and his buddy Yarvin's toxic philosophy here:
https://en.wikipedia.org/wiki/Dark_Enlightenment#Summary_of_...
... and then read various essays by Thiel himself, where you'll encounter more dog whistles than in a dog training center.